There are a lot of yellows that fall into this in between grouping for me. It seems that yellows tend to shade towards other colors rather than sitting firmly in yellow.
Both the yellow-greens and the yellow-oranges, like this photo, are ones I have a hard time just calling yellow. Unlike yesterday’s magenta, it doesn’t usually straddle the cool or warm barrier and lands firmly on the warm end of the spectrum. Probably because most of the colors it usually holds also still have a base of yellow. Anything else and it dips into a very neutral brown.
TJ Fox: Sharing the Experience 